Abstract
Biocorrosion properties and blood- and cell compatibility of pure iron were studied in comparison with 316L stainless steel and Mg–Mn–Zn magnesium alloy to reveal the possibility of pure iron as a biodegradable biomaterial. Both electrochemical and weight loss tests showed that pure iron showed a relatively high corrosion rate at the first several days and then decreased to a low level during the following immersion due to the formation of phosphates on the surface. However, the corrosion of pure iron did not cause significant increase in pH value to the solution. In comparison with 316L and Mg–Mn–Zn alloy, the pure iron exhibited biodegradable property in a moderate corrosion rate. Pure iron possessed similar dynamic blood clotting time, prothrombin time and plasma recalcification time to 316L and Mg–Mn–Zn alloy, but a lower hemolysis ratio and a significant lower number density of adhered platelets. MTT results revealed that the extract except the one with 25% 24 h extract actually displayed toxicity to cells and the toxicity increased with the increasing of the iron ion concentration and the incubation time. It was thought there should be an iron ion concentration threshold in the effect of iron ion on the cell toxicity.
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Acknowledgments
One of the authors (Erlin Zhang) would like to acknowledge the financial support from the Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS), Shenyang Science and Technology Institute (Program No. 1062109-1-100), and Heilongjiang Provincial Nature Science Fund (No. E2007-18).
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Zhang, E., Chen, H. & Shen, F. Biocorrosion properties and blood and cell compatibility of pure iron as a biodegradable biomaterial. J Mater Sci: Mater Med 21, 2151–2163 (2010). https://doi.org/10.1007/s10856-010-4070-0
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DOI: https://doi.org/10.1007/s10856-010-4070-0